CVE-2026-13311

Description

shell-quote prior to 1.8.5 finalizes parsed tokens in parse() using Array.prototype.concat as a reduce accumulator, which reallocates and copies the entire growing array on every iteration. As a result parse() runs in O(n^2) time relative to the number of input tokens. An attacker who can supply an attacker-controlled string to any code path that calls parse() (no shell metacharacters are required; plain space-separated words suffice) can block the single-threaded Node.js event loop for an extended period with a small input, resulting in a denial of service. There is no code execution or data disclosure; impact is to availability only. Fixed in 1.8.5.

Weakness classification

• 7ffcee3d-2c14-4c3e-b844-86c6a321a158: CWE-407

Primary references

• 7ffcee3d-2c14-4c3e-b844-86c6a321a158 — Vendor Advisory
• 7ffcee3d-2c14-4c3e-b844-86c6a321a158 — Product
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Vendor Advisory